HD66727 Datasheet, PDF (60/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
OPOFF = GND
V_CC
Open
V_CC
R
V2 ^R
R
V3 ^R
R
R
V _EE
VR
V_EE
AGND
HD66727
+-
V1
+-
V2
+-
V3
+-
V4
+-
V5
LCD
multiplexing
driver
LCD static
driver
GND
a) 3- or 4-line display with 1/6 bias
SEG1–SEG60
COM1–COM32
COMS1–COMS2
ASEG1–ASEG12
ACOM
OPOFF = GND
V_CC
V_CC
R
V2 ^R
Short-circuited
R
V3 ^R
R
R
V _EE
VR
V_EE
AGND
HD66727
+-
V1
+-
V2
+-
V3
+-
V4
+-
V5
LCD
multiplexing
driver
LCD static
driver
GND
b) 1- or 2-line display with 1/4 bias
SEG1–SEG60
COM1–COM16
COMS1–COMS2
ASEG1–ASEG12
ACOM
Notes: 1. Potential differences between V_CC and V1 and between V5 and V_EE must be 0.4V or greater,
particularly for low-duty drive such as 1-line display.
2. When the internal operational amplifiers cannot fully drive the LCD panel used, an appropriate
capacitor must be inserted between each output of V1OUT to V5OUT and V_CC to stabilize the
operational amplifier output.
Figure 33 External Power Supply Circuit Example for LCD Drive Voltage Generation
60